This closing coil is used for the instantaneous remote tripping of the MasterPact MTZ circuit breaker. In conjunction with an MX opening coil and an MCH motor operator, the MasterPact can be remotely controlled. Tripping occurs instantaneously via Modbus communication. The closing coil includes a diagnostic function that can be called up via Modbus communication. Instantaneous closing coil XF diag&com 277V AC for MasterPact MTZ fixed installation. This tripping coil can only be ordered in conjunction with a configured circuit breaker.